Substituted (nitrofuryl-acrylidene) hydrazines with antibacterial properties

ABSTRACT

Compounds of the formula   IN WHICH N 1 OR O, G is a member of the group formed by the furoyl, thenoyl, nitrothenoyl and carbobenzoxy radicals and R, when n 1, is a member of the group formed by hydrogen, the methyl, butyl, isobutyl, delta -(2-furoyl) amino-butyl, hydroxymethyl, benzyl and p-hydroxybenzyl radicals, are endowed with antibacterial properties, and are useful in bacteriocidal compositions.

' United States Patent Szarvasi et al.

[ 1 Oct. 21, 1975 SUBSTITUTED (NITROFURYL-ACRYLIDENE) HYDRAZINES WITH ANTIBACTERIAL PROPERTIES Inventors: Etienne Szarvasi,

Charbonnieres-les-Bains; Louis Fontaine, Lyon, both of France Assignee: Lipha, Lyonnaise Industrielle Pharmaceutique, Lyon, France Filed: July 13, 1973 Appl. No.: 379,172

Published under the Trial Voluntary Protest Program on January 28, 1975 as document no. B 379,172. 7

Related US. Application Data Continuation-in-part of Ser. No.,,2l5,677, Jan. 5. 1972.

Foreign Application Priority Data Jan. 7, 1971 France 71.00283 US. Cl 424/275; 424/285 Int. Cl. A61K 31/38 Field of Search 424/275 [56] References Cited OTHER PUBLlCATlONS Stvadins et al, Latviajas PSR Zinatnu Akad. Vestis, 1958, No. 1, pp. 113-120. Chemical Abstracts 54: Col. 20085g (I960).

Primary ExaminerJerome D. Goldberg Attorney, Agent, or Firm-Browdy and Neimark [57] ABSTRACT Compounds of the formula 9 Claims, No Drawings 1 SUBSTITUTED (NITROFURYL-ACRYLIDENE) IIYDRAZINES WITH ANTIBACTERIAL PROPERTIES This is a continuation-in-part application of Serial 5 oxone and the N-(Z-furylidene)-3-amino-hydantoin, at present known under the' commercial mark .FURA- DOlN. These known products-arsed in pharmacy do,

however, have inconveniences, such as an emetic effect.

The novel nitrofurans of the present invention, as

well as having an appreciable antibacterial activity at a toxicity level of the same order as that of Fu'roxone, and decidedly lower than that of Furadoin, have the very great advantage of not being emetic.

The (nitrofurylacrylidene) hydrazines of the inventron are represented bythe formula: I

in which n l or G is a furoyl, thenoyl, nitrothenoyl' or carbobenzoxy radical; and R, when n l, is hydrogen, a methyl, butyl, isobutyl, 8-(2-furoyl)-aminobutyl, benzyl, hydroxymethyl or p-hydroxybenzyl radical. lt is possible to obtain these novel hydrazines by reactron of -nitro-2-furyl acrolein with a hydrazine which is represented by the formula G (NH cu co) NH NH (11) l a in which n, G and R have the same meanings as in formula I. These hydrazines can be obtained by hot condensatlon in organic solvent medium. Novel substituted 'hydrazides, which can be used particularly asintermediaries in the synthesis of the compounds according to formula I, are represented by the formula G (NH ca co) NH NH in which G is a furoyl, then'oyl, -nitrothenoyl or carbobenzoxy radical, except when R is hydrogen, a hydroxymethyl or p-hydroxybenzyl radical; [I r and R is hydrogen, a methyl, butyl, isobutyl, hydroxymathy}, p-hydroxybenzul, benzyl or furoylbenzyl ra rca.

. A 2" These hydrazides can beobtained by reacting the hydrazine with an amino ester of formula G NH CH CO C H5 (III) According to one variant, the process can be used in the'presence of a catalytic quantity of acid, such as acetic acid.

Certain novel amino esters can be used particularly as intermediaries in the synthesis of hydrazides and hydrazinesas previously described. These amino esters are represented by the formula:

G Nl-l f CH C0 C H (111') in which G is a furoyl radical, when R is a methyl, 8-(2- furoyl)'-'aminobutyl or p-hydroxybenzyl radical, a thenoyl radical when R is hydrogen, a butyl or isobutyl radical, a nitrothenoyl radical when R is a hydroxymethyl or benzyl radical, or carbobenzoxy when R is an isobutyl radical.

These amino esters can be obtained by reacting an amino ester of formula H N on co c n with an acid chloride of formula G Cl, in which G and R have the same meanings as in formula (lll'), in the presence of an alkali agent. According to variants, the alkali agent is mineralor organic, such as the acid carbonate of sodium,triethylamine,- pyridine.

The novel (nitrofurylacrylidene) hydrazines are distinguished by their ability to inhibit the growth of bacteria. This effect extends to gram-positive and gramnegative organisms.

Biological research has, made, apparent the importance of the nature of the protective group G of the general formula 'I. The effect of these groups can be classed in the following order:

Since it has been established to be advantageous to select the heterocyclic carrier of the N0 group participating in the formation. of the Schiff base from the family of furans and thiphenes, the biological activity being completely lost when they are replaced by the isostere: pyrol, the [N (5-nitro-2'-thenoyl)-N (5"- nitro-2"-furyl-acrylidene)] -hydrazine and [N L (5'- nitro-2-thenoyl glycyl)-N -(5"-nitro-2"furyl acrylidene)] hydrazine form particularly outstanding active principles.

These two products have an activity in vitro" which I is identical with that of Furoxone for an equal toxici ty. In addition, a particularly important fact is that theseactive principles are free from any emetic effect on dogs, even in a strong dose.

The medicaments of the invention have low toxicity, the strongest dose tolerated by mice by oral route being at least 3200 mg/kg,

The results of pharamcological tests are set out in the following tables l and II.

In table I, the control substance is Furoxone and in table II it is Furadoin.

ll CH2CONH N cr1 The antibacterial coefficients have been determined in vitro in the majority of cases on specific E, COLI strains.

TABLE I LDSO-Kg Example Antibacterial coefficient perorally mice Control 100 Ex. 1 Ex. 2 106 3.200 mg Ex. 3 115 3.200 mg Ex. 4 120 in vitro 3.200 mg 73 in Vivo Ex. 5 175 3.200 mg Ex. 7 58 3.200 mg Ex. 8 75 3.200 mg Ex. 9 118 3.200 mg Ex 10 97 3.200 mg Ex. 12 120 3.200 mg Ex 13 113 3.200 mg Ex 14 94 3.200 mg Ex 15 100 on gram-positive germs 3.200 mg Ex 16 95 3,200 mg TABLE I1 Examplc Antibacterial coefficient LDSO-Kg perorally mice Control 100 Ex. 6 115 3.200 mg l 1 140 3.200 mg The daily dose sufficient to obtain the desired therapeutic effect on a human being varies from approximately 10 to 500 mg. More particularly, effective results are obtained using 10 mg. of active compound per kg. of weight of the patient. The preferred posology for adults consists of 600 mg. per day in three 200 mg. doses. These compounds are administered orally as antibacterial agents effective against gastrointestinal infections, e.g. for bacterial infections of the urinary tract.

These compounds can be easily administered: the pharmaceutic doses can be formulated in the usual manner, with the aid of conventional excipients and adjuvants in the form of powders, suspensions and tablets, suppositories, etc. for internal administration and ointments and salves for topical administration.

Examples illustrating the invention in a nonlimiting manner are given below.

EXAMPLE 1 N [2-thienyl acetyl] -1 l [5-nitro-2'-pyrroly1idene] -hydrazine L ll N0 I H 1 IO 4 3 11 278.28

3.9 g (mol/40) of (Z-thienyl acetyl) hydrazide are dissolved in 32 ml of methanol, whereafter 3.5 g (mol/40) of 5-nitro-2-pyrroladehyde in 35 ml of tetrahydrofuran are added. Heating under reflux takes place for 5 hours. After cooling, adding ether and then cooling in the refrigerator, there are obtained:

1st cut 3.6 g yellow Mp =188190 C, 2nd cut: 1.7 g yellow Mp 190-192 C. The yield is 5.3 g. i.e. 76 (theoretical yield 6.95

The 1st cut, after being recrystallised twice from'isopropanol and dried at 50 C under strong vacuum, melts at 192-194 C.

23.4 g (mol/S) of (i) alanine ethyl ester are dissolved in ml of dry benzene. 20.3 g (mol/S )=20.22 g) of triethylamine are added, followed by dropwise addition of 26.1 g (mol/5) of furoyl chloride. The temperature is raised from 22 to 35 C and there is a precipitation of crystals of After suction-filtering, washing with water and drying, and also evaporation of the solvent, there is obtained a quantitative yield of 42.2 g of product of Mp 68-71 C. After being recrystallised twice (diisopropylether) the melting point is 72-73 C.

Gravimetric analysis:

C% H% N% Calculated 56.85 6.20 6.63

Found 1 56.83 6.19 6.58

b. N -[N 2' furoyl (i) alanyl]- hydrazide I 5 a"n"33 -C(IlH-CH-COIH-NH 14:191.,19 O.

21.1 g (mol/lO) of N-furoyl (i) alanine ethyl ester, 20.2 g (mol/2.5)=20 g of NH NH .98% H 0 and 0.5 ml of acetic acid are heated under reflux for 5 hours.

After evaporation to dryness, the oily residue which is obtained is dispersed under ether and this is solidifled. A white product of Mp 1 15120C is obtained with a quantitative yield, this product melting at l32-133 C after being recrystallised twice from isopropanol.

EXAMPLE 4 N -[N '-2'-thenoylglycyl]-N 5 '-nitro-2' 'furyl acrylidene1- hydrazine Gravimetric analysis C% H% N% Calculated 48.72 5.62 21.31

Found 48.61 5.77 21.17

c. N -[N' 2 furoyl (i) alanyl]- N -[5 nitro-2- furyl acrylidene]- hydrazine g (mol/20)#9.85 g) of N -[N-furoyl (i) alanyl]-hydrazide, in 120 ml of methanol, and 8.4 g (mol/20 8.35 g) of 5-nitro-2-furyl acrolein, in 63 ml of tetrahydrofuran, are heated together under reflux for one hour. After concentration to half volume, cooling in a refrigerator, suction-filtering, washing with isopropanol and then with ether, 1 1.8 g of product are obtained with a yield of 80.5 (theoretical yield 14.65 g), the product having a melting point of l92 l95 C (with decomposition). After recrystallisation from acetone, the melting point is l97.5-198.5 C with decomposition.

Gravimetric analysis N -[N carbobenzoxyglycyl1- N -[5'-nitro-2'-furylacrylidene]-hydrazine a. Ethyl-N-thenoyl-2-glycocollate U com-ca -co c n Method A To 14.2 g (mol/7.25) of ethyl glycocollate in solution in 70 ml of pyridine are added dropwise 20.2 g (mol/7.25) of 2-thiophene carboxylic acid chloride. Agitation takes place for 1 hour at ambient temperature and then the mixture is poured into iced water. Suction-filtering, 1st cut 19.4 g coloured. Mp 86-88 C. The mother liquors, extracted with ethyl acetate, yield a second cut 6 g coloured, Mp 86-88 C. Yield 25.4 g 86.4 (theoretical yield 29.4 g).

Method B To a solution of 21.1 g (mol/6.6) of ethyl gylcocollate hydrochloride, in 150 ml of water, containing 25.3 g (mol/3.3) of NaHCO there are simultaneously added while stirring well 24.1 g (mol/6.6) of 2- thiophene carboxylic acid chloride and 38 ml of an aqueous solution containing 12.7 g (mol/6.6#) of NaHCO Thetime taken for the addition is 15 minutes. Heating at C takes place for 1 hour. The solid is precipitated on completing the addition. After suction-filtering, washing with water, there are obtained 25.5 g 79% (theoretical yield 32.2 g) of coloured product, Mp 8890 C.

After recrystallisation, (diisopropyl ether ethyl acetate), a white product of Mp 90-90.5 C is obtained.

- ocmm-cn -ccun-n-cn-cn-cn x0 Gravimetric analysis C% H% N% Calculated 54.83 4.33 15.04

Found 54.92 4.38 15.06

Gravimetric analy' sis C% H7: N7 S71 Calculated 50.70 5.20 6.57 15.04

Found 50.72 5.23 6.54 14.99

1 NH 3.400 cm 11 CH =CH (thiophene) 3.120 cm v CO (ester) 1.740 cm" 0 CO (conjugated amide) 1.650 cm b. N -[N '-2 '-thenoylglycl]-hydrazide:

l CONH CH CONH N5 C1B9R3o2s 21.3 g (mol/lO) of ethyl N-2-thenoyl glycocollate, 20 g (mol/2.5) =20 g) of 98 hydrazine, 30 ml of isopro- Gravimetric analysis C7r H7: N9? 8% Calculated 42.20 4.53 21.10 16.10

Found 42.29 4.60 21.05 16.16

11 NH 3,300 cm CO (conjugated) 1,630 1,650 cm v CO 1,670 cm v CH CH (thiophene) 3,080 cmv C C (thiophene) 855 cm 1,030 cm 1,060 cm c. N-[N-2'-thenoylglycyl]-N -[5"-nitro-2"- furylacrylidene]- hydrazine 8 g (mo1/25)= 7.95 g) of N-[N-2-thenoylglycyl]- hydrazide are dissolved at 60 C in 200 m1 of ethylene glycol. At a temperature of 50 C, 6.8 g (mol/25) of 5- nitro-2-furyl acolein in 68 ml of tetrahydrofuran are introduced. Crystallisation is produced a few minutes after the addition. Heating takes place at 50 C for 30 minutes. After suction-filtering and washing with ether,

there are isolated 13.8 g of solid with a melting point of 233234 C (with decomposition) and with a yield of 99.3 (theoretical yield 13.9 g). After recrystallization from a mixture of dimethyl formamide and ether, the melting point is 233 C (with decomposition).

Gravimetric analysis N -[5 -nitro-2-thenoylglycyl]-N -[5 "-nitro-2 "-furyl acrylidene]- hydrazine m cmm-cu -cm s I I F CE-CMH- m a) N'-[5'-nitro-2-thenoylgylcyl]-hydrazide 21.2 g (mol/12.15) of ethyl 5-nitro-2-thenoyl glycocollate are dissolved in 480 ml of methanol and the solution has added thereto very slowly, at a temperature of5 C, 12.8 g (mol/4= 12.5 g) ofNl-l -NH 98 H O in 40 ml of methanol. The mixture is cooled to 0 C and agitation is continued for 2 hours at this temperature.

'45 minutes after the commencement of the cooling,

crystallisation occurs. After suction-filtering (difficult) in the presence of ether, there are obtained 1st cut 11.5 g, yellow, Mp =186187 C 2nd cut 4.8 g, yellow, Mp 189.5-190 C. The yield is 16.3 g 80.5 (theoretical yield 20 g). After being recrystallisation twice (water), Mp 190.5-191 C.

Gravimetric analysis C% H% N% 5% Calculated 34.42 3.30 22.94 13.13

Found 34.55 3.34 22.90 13.25

I NH 3,300 cm v CO 1,680 cm" 1! CO conjugated 1.640 cm" v N0 1 1,580 cm b. N-[5-nitro-2'-thenoylglycyl]-N -[5"-nitro-2"- furylacrylidene]- hydrazine At a temperature of 60 C, 6.1 g (mol/40)of N [nitro-2-thenoylglycyl]-hydrazide are dissolved in 200 m1 of ethylene glycol. At the same temperature, 4.2 g (mol/40) of 5-nitro-2-furyl acrolein in 42 ml of tetrahydrofuran are introduced into the solution. Heating takes place for 1 hour at 60 C. A precipitation of red crystals is observed after cooling. (In certain cases, after heating for half an hour). After filtering with suction and washing with water, there are obtained 8.1 g, yield 82.6 (theoretical yield 9.84 g) of an orange product, Mp 217-218 C.

After recrystallisation (8.1 g in 875 ml of ethyl acetate) and drying to constant weight at C under a strong vacuum, the melting point is 222-224 C (with decomposition).

Gravimetric analysis 9 EXAMPLE 6.

hydrazine I u '1'- COBB-41 a E Qmz 14.2 g (mol/10) of N- (2-thenoyl)-hydrazide in crude form are dissolved in 140 ml of methanol. 16.7

g (mol/lO) of 5-nitro-2-fury1 acrolein in 167 ml of tetrahydrofuran are added dropwise thereto. The solution is heated under reflux for one hour. Crystallisation is observed 5 minutes after completing the addition.

After cooling, there is obtained a first cut of 16.9 g of Gravimetric analysis E H- cqm 2- 11% N% s% 4 10 (mol/3.3) of NaHcO While stirring vigorously, there are simultaneously added 26 g (mol/5 of furoyl chloride and 50 ml of an aqueous solution of 16.8 g (mol/S) of NaHCO The addition lasts 20 minutes. Heating to 50 C takes place for one hour, followed by extraction with ethyl acetate and evaporation to dryness, the oily residue which is obtained slowly solidifying. The yield ,4

is 22.9 g 63 (theoretical yield 36.2 g) as a white solid of Mp 10ll0 2 C.

vCH=CH'(furan) 2% l i i-\ Calculated 49.48 3.11 14.43 11.01 30 o {m 0 Found: 49.50 3.14 14.36 11.12 11 NS 3,280 cm: l N 1,540 :CO (conjugated) 1.650221 16.1 g (mol/20) Of N, N-2-d1furoyl (i) lySll'le ethyl ester, in solution in isopropanol, 10.2 g (mol/5 EXAMPLE 7 10 g) of N11 Nl-l 98 H 0 and 0.5 ml of acetic CHE-CH:

a) f-fl 'difimoyl lysine ethyl ester 1 mac-U a $62.55

24.7 g (mo1/10) of lysine dihydrochloride ethyl ester are dissolved in 200 ml of water containing 25.4 g

v 40 zt-nH-co-CH -(cB 41100; o

acid are heated for 5 hours. The solution is evaporated to dryness and the residue is dispersed under ether, and there are'obt-ained 16 g. yield 92 (theoretical yield 17.35 g) of a white product melting at 155158 C. After recrystallisation (ethanol), the melting point 161-162 C.

L'L EQ.

' C% H% N% Calculated 55.17 5.78 16.08

Found: 55.12 5.80 16134 v NH 3,350 cm v CO (large) 1,630 1.670 cm" 11 CH; 2,950 cm 0. N-[5-nitro-2 fury lacrylidene]-N -[N, N -2"- difuroy1(-' lysyl]-hydrazine In accordance with the conditions of Example 3,

starting .With 8.7 g (mol/40) of N -[N, N2- difuroyl (i) lysyllhydrazide, in ml of methanol, Y

1,650 art (conjugated) l C H) A 110 .550 m" EXAMPLE 8 g N- [carbobenzoxy (i) 1eucy1]-N -[5-nitro-2-furylacrylidene]- hydrazine CH W XTH-ECONH-JldJH-CHH-Il D 10 a. 11-(- carbobenzofly lmrcine ethyl ester 3 ocmm-g-co c u At about 0 C, 39.1 g (mol/S) of (t) leucine ethyl ester hydrochloride are dissolved in 100 ml of water 50 containing 33.5 g (mol/2.5) of NaHCO There are simultaneously added 34 g (mol/5) of carbobenzoxy chloride and 50 ml of an aqueous solution of 16.7 g (mol/5) of NaHCO On completing the addition. stirring is continued for 10 minutes at ambient temperature. The oil which forms is extracted with ether and distilled. The yield is 37.3 g 63.6 (theoretical yield 58.6 g) of a yellow oily product. Boiling point O.37-O.4 138-139.5 C.

Chromatography in vapour phase reveals the presence of 20 of volatile impurities.

b. N-carbobenzoxy (1') leucyl hydrazide cn ocoua aura-m 29.3 g(mol/10)of N-carbobenzoxy (i) leucine ethyl ester, 320 ml of ethanol, 20.4 g (mo1/2.5 20 g) of 98 7r hydrazine hydrate and 0.5 ml of acetic acid are left at ambient temperature for 48 hours and then evaporated to dryness. The residue is washed with water and extracted with ether. After evaporation of the ether, an oil is left which is dried under strong vacuum. The yield is 12.3 g=44.2 (theoretical yield 27.9 g) ofa product which melts at 104105 C. After recrystallisation (propylene oxide-heptane [2 1], Mp 105-108 C.

This product is not analytically pure and it is used as such.

v NH 3.240 3.340 cm v CH CH (benzene) 3,050 cm v CO (amide) 1.650 cm v CO (Cbo) 1.730 cm" c. N-[carbobenzoxy (i) leucyl]-N -[5-nitro-2'- fury1acrylidene1- hydrazine To 14 g (mo1/20 13.96 g) of carbobenzoxy (i) leucyl hydrazide in ml of methanol are added 8.4 g (mol/20 of 5-nitro-2-furyl acrolein in 84 ml of tetrahydrofuran. Crystallisation is produced before the addition is completed. Heating under reflux takes place for one hour, followed by concentration to half volume. At ambient temperature, ether is added, cooling takes place and there are obtained 10.9 g [yield 88 (theoretical yield 12.4 g] of yellow solid, Mp 142145 C.

After recrystallisation (ethanol) Mp 145.5-146 Analysis C% H% N% Calculated 58.87 5.64 13.08

Found: 58.75 5.71 13.12

- v NH 3.320 cm v CO 1.690 cm v NO, 1,520l.550 cm EXAMPLE 9 te zQ 4 II 404.43

th noyl) leucine ethyl ester Following the conditions of Example 8 and starting W es 01s c 11 11 with 6.4 g (m0l/40 =6.38 g) of N-[N'-(2'thenoyl) (i) l 3 leucyl]-hydrazide. After heating under reflux for 2 I 2 hours, concentration to half volume. adding ether and CONH ca co C2 {1 g 5 crystallising at ambient temperature, there is obtained 2 I a first cut of 5.5 g of a yellow solid, Mp =1s9-190 c, i and a second cut of 2.7 g of yellow solid, Mp Method A M 0 0 Starting from the free amino ester. Following the 20 The second cut, recrystallised from methanol, yields conditions of Example 4, with a ield of 67.6 a prod- 1.3 g of product, Mp l93-l94 C. Yield 6.8 g 67.5

v y not 15 obtained which distils, B l33l36 C, and (theoretical yleld 10.1 g). After recrystallisation then is solidified, Mp 6264 C. from et Mp l9 5 C- Method B Starting from the hydrochloride (i) leucine ethyl es- 2 C9 N7! 5% ter. Following the conditions of Example 4, with a yield Calculated: 53.46 4.93 [3.86 7.92 of 89.4 there is obtained a white solid of Mp 66- ld 1 53.50 5.01 13.79 8.00 67 C the product dlstlls, B, l35l37 C. v a 3340 -i 1 CO (conjugated) L640 cm 1 CO L690 cm 1 NO: [520-1540 cm" Chromatography in vapour phase V.P.C. (column S. E.p:':iy::==l020lqi C H2 50 ml/mln) EXAMPLE l0 NH 3300 -i N'-[N'-carbobenzoxy (i) v CH CH (thiophene) 3.100 cm" seryl]-N -[5 -nitro-2-furylacrylidene hydrazine v Co 1.720 cm" CH ocomt -c01m-l1= 2 E tn b. N'-[N-(2'-thenoyl) (i) leucyl]-hydrazide 2 CH C H O S I a 511752 CH-CH -CH-L lll l? COHH COHH I 2 o 55 33 c n luq 14 402.35

S The following are left at ambient temperature for 48 10 g 9 N'carqobgnzqy (i) Seryllhydra' hours 1 13.5 g (mol/20 13.45 g) of N-2-thenoyl (i) 50 me are 200 m o t i methano' g leucine ethyl ester 220 ml of ethanol 10 2 g (mm/5 (mol/25) of 5-n1tro-2-furyl acroleln 1n 51 ml of tetrahy- 10 g) of NHTNQZ 98 H20 and 6 6 of acetic drofuran are added at a temperature of 50 C. After acid. By evaporation to dryness, an oily residue is obfi g 2 Es g g a tained which, when ether is added, crystallises, yielding a 0 3 10 g 79 (theoretical yield 12.7 g) ofa solid melt- 55 one mght m the rgngefator there are Oblamed 2 g ing at l45-l47 C. After recrystallisation (ethanol) =67'5 (theorencal yleld: 16g) Ofaproductmeltmg Mp o o C at l50-l5l C. After recrystallisation (ethanol). Mp

' =l5l-l52 C.

Analysis 6O c% H% N% s% C7 N7 Calculated 51.75 6.71 16.46 12.96 Calculated 1 5373 450 13-93 Found 1 5l.78 6.65 16.40 12.59 53* 1 2; 4m 1393 vNH 3200 cm" -i Co 1.700 1.730 :1 21; CH (thlophene) x28 5 L 1.560 -i cm -vCN 1,370 cm EXAMPLE 1 l c. N-[N-(2-thenoyl) (i) leucyl] N -[(5"-nitro- 2"-furyl)-acrylidene]-hydrazine N -[5 -nitro-2 -thenoyl]-N 5 -nitro-2 furylacrylidenelhydrazine no F 2 U commas-cuss 2 16 a) For leucine ethyl eater (l2), a le v 5 m CH 00 6 11 11 159- 2 t2 8 4 6 I a 33627 66 g (mol/2) of Nor (i) leucine are suspended in 375 ml of absolute ethanol. Hydrochloric acid gas is introa) EttqL-fS-nitro-E-thiflphene carbozgylate duced into the mixture at boiling point for 6 hours 10 (until saturation is reached). The substance is evaporated to dryness and then the treatment is repeated W with fresh ethanol. After again being evaporated to drym I ness, the crude hydrochloride is treated with chloro- 2 H 201,13 form, saturated with N11 By distillation, there are oh- 4 tained 38.7 g ofa colourless liquid of Bp 102l03 4 g (mol/lo 731 g) of smitrothiophene can C after redlstillation Bp g 9899 C. V. P. C. 100 boxylic acid are dissolved in 85 ml of absolute ethanol. A stream of gaseous hydrochloric acid is caused to enter the boiling solution to the point of saturation, and Analysis 1 for 5 hours. Evaporation to dryness takes place and c% 11% N7: then the solid residue is washed with a sodium bicar- Calculated: 60-34 1076 bonate solution. It is suction-filtered and washed with Found; 6030 1030 815 water. After drying, there are obtained 17.7 g of a yellow product with a melting point of 6365 C and the yield is 88 (theoretical yield 88 calculate; 3 5 5 5,80

The N -(5'-nitro-2-thenoyl)-hydrazide is prepared 1 by reacting hydrazine with ethyl 5-nitro-2-thiophene Found a 60.30 10.80 carboxylate. 4 b. 6.3 g (mol/=6.25 g) ofN-[5'-nitro-2-thenoyl]- 30 Y 3-3 3.4 m hydrazide are dissolved in 100 ml of dry tetrahydro- .4 furan. 5.6 g (moi/3O 5.55 g) of 5-nitro-2-furyl acroco m lein in 56 ml of tetrahydrofuran are added. Heating c 70 d under reflux takes place for 1 hour and, 25 minutes after starting the heating, the crystallisation commences the crystals are suction-filtered, washed with ether and dried. There are obtained 7.9 g (yield 70 (N2 thenoyl)-Nor (i) leucme ethyl ester theoretical yield 1 1.2 g) of a yellow solid of Mp 235236 C. 0 H 150 S Recrystallisation (tepid dimethyl formamide +ether) 40 i 13 3 v ltin oin lea es the me g p t unchanged 23 Analysis cam 002C235 H a 269.34

C71 11% N% 5% Calculated: 2A0 15.9 g (mol/ 10) of Nor (i) leucine ethyl ester are Found 1 42-87 16-53 dissolved in ml of pyridine, whereafter there are introduced 14.7 g(mol/1O 14.65 g) of 2-thiophene car- K CO i 650 d boxylic acid chloride. The mixture is left for one hour 50 at ambient temperature and then it is poured into iced c 2 "560 water. The 011 WhlCh forms quickly crystalllses. There are obtamed 24 g of a light yellow product with a meltc a H i,630 ing point of 80-8 1 C, with a yield of 80.7 (theoretical yield 26.9 g). After recrystallisation (ethyl ace- E 4 tate), the melting point is 8l82 C. i 0 5 m i Analysis EXAMPLE 12 C% 11% N% 5% I Calculated 57.97 7.11 5.20 11.90 N-[(2 thenoyl) Nor (i) leucyl] N -[S"-nitro-Z"-furylacrylidene]- hydrazine 1 1 I l coxm-cn-ctxm-n=ca-ca=cn o 17 5.340 a I ca on 3.100 m" co (enter) a 1,760 cm" a 1,640 en" c 1.031 cm" and 740 an" 3 c. N'-[(2-thenoyl) Nor (i) leucyl]-hydrazide c r: 0 a

(3:11 It 255.33 comm 13.5 g (mol/2O 13.45 g) of N Z-thenoyl -Nor-(i) leucine ethyl ester, ml of isopropanol, 10.2 g (mol/5 10 g) of NH NH 98 H 0 and 0.5 ml of acetic acid are heated under reflux for 5 hours. The crude reaction mixture with addition of ether yields 11.5 g of white crystals with a melting point of -l16-1 18 C. Yield 90 (theoretical yield 12.8 g). After recrystallisation (isopropanol), the melting point is 127- 1 28 C.

Analysis 1 C% H72 N% 5% Calculated 51.75 6.71 16.46 12.96

Found 51.77 6.69 16.47 12.54 7 NH 3,300 cm (a single peak) CO (conjugated) 1,640 cm" CO 1,670 cm furyl-acrylidenel-hydrazine 8.5 g (mol/30) of N-[(2'-thenoyl)-Nor-(i) leucyllhydrazide in 180 ml of methanol and 5.6 g (mol/30) of 5-nitro-2-furyl acrolein in'56 ml of tetrahydrofuran are heated under reflux for 2 hours. After concentration to half volume, there are obtained, in two cuts 7.7 g of product of melting point 1 88-192 C, yield 57.5 (theoretical yield 13.4 g).

After being recrystallised twice (ethyl acetate); the melting point is 20020l C (with decomposition).

.'. l EXAMPLE 13 f -[5 '-nitro-2'-furylacrylidene]-N -[(N -carbobenz0xy) tyrosyl]-hydrazine ca Cit-CK: raa-con-mococn a c n 1r o a 478.44

At 70 C, 11 g (mol/30 10.97 g) of (N-Cbo (i) vtyrosyl)-hydrazide are dissolved in 180 ml of ethylene glycol and then 5.6 g (mol/30) of 5-nitro-2-furyl acrolein in 56 ml of tetrahydrofuran are introduced at a temperature of 60 C. Heating takes place for 2 hours at 60 C and then water is added until a clouding is formed. There is obtained an impure yellow solid, which is separated by filtering with suction. 16.3 g of product (theoretical yield 16.1 g) are obtained with a melting point of 123-125 C. After recrystallisation from 150 ml of methanol, a product with a melting point of l82-183 C is obtained in a yield of 9.1 g 56.5 (theoretical yield 16.1 g).

-Aftera second recrystallisation from methanol, the

'- melting point is,l84l85 C.

(0 a c) 1.015 -1.0'r5 an" EXAMPLE 14 (SH-(25 m! a) B-2'-fizroyl tyrosine methyl ester 'lS IS S Between and C. 23.2 g(mol/10 23.16 g) of a hydrochloride of tyrosine methyl ester are dissolved in 100 ml of water which contain 33.5 g (mol/lO) of NaHCO While stirring, there are simultaneously added 13 g (mol/lO) of furoyl chloride and 8.5 g (mol/lO) of NaHCO in 85 ml of water. Heating takes place at 50 C for one hour. the product is agglomerated and it solidifies when the heating is terminated. After filtering with suction and washing with water, there are obtained 24.6 g ofa slightly coloured product which has a melting point of 1l7l 19 C, the yield being 85.4 7: (theoretical yield 28.9 g). After recrystallisation (ethyl acetate traces of hexane), the melting point is raised to 123l25 C.

Analysis c 71 H71 NVt Calculated 62.29 5.22 4.84

Found 62.24 5.20 4.77

1105 3.680 5.400 at" (large) 745m" co (ester) 1.740 air sea on" co (snide 1.640 m" 1,020 m" mm R 11, 1,110 an" b) N-[N-2-furoyl (t) tyrosyll-hydrazide l com E2- cam an 0 a HR CB= on The following are left at ambient temperature for 48 hours 14.5 g (m0l/20 of N-furoyl (i) tyrosine methyl ester in 220 ml of alcohol (to be made tepid for dissolving purposes), 10.2 g (mol/5 =10 g) of NH NH .98 H 0 and 0.5 ml of acetic acid. Crystallisation occurs and, after being left for a short time in the refrigerator and adding ether, there are obtained by suction-filtering 10.2 g of white product, yield 70.6 (theoretical yield 14.45 g), with a melting point of 174-175 C. After recrystallisation from ethan01, the melting point is 175.5-176 C. n

Analysis C71 H7? N92 Calculated 58.12 5.22 14.52

Found: 58.10 5.30 14.48

7 OH 3.600 3.400 cm" NH 3.300 cm CO (conjugated) 1.650 cm" furylacrylidene]- hydrazine At the temperature of 60 C. 14.5 g (mol/20 of N'-lN-2-furoyl (i tyrosyl]-hydrazide are dissolved in 320 ml of ethylene glycol. At a temperature lower than 60 C. 8.4 g (mol/20) of 5-nitro-2-furyl acrolein in 84 ml of tetrahydrofuran are introduced thereinto. After heating at C for 4 hours. the tetrahydrofuran is evaporated under vacuum.

By filtering with suction (difficult) and after washing with water, a yellow solid is separated which has a melting point of l92-l94 C. After recrystallisation (water-dimethyl-formamide 1 1), Mp 229-230 C. yield 12.4 g 57 7r (theoretical yield 21.6 g).

EXAMPLE 15 N -lN' -(5-nitro-2-thenoyl (i) phenylalanyll-N -l5"-nitro-Z"-furylacrylidene]- hydrazine 2 CQIlH CH (20 C 8 19.3 g (mol/lO of (i) phenyl alanine ethyl ester are dissolved in 150 ml of pyridine. 19.2 g (mol/lO l9.l5 g) of 5-nitro-2-thenoyl chloride are added in small portions. After stirring at ambient temperature 40 (theoretical yield g) of yellow product of Mp 206208 C are obtained, and following a second recrystallisation from ethanol, the melting point is 2l4-2l6 C.

for l hour, cooling in iced water, filtering with suction 20 and washing with water, there are isolated 29 g of a product having a melting point of l50l5 1 C, with a yield of 83.5 (theoretical yield 34.8 g). l

C7 H9? N7 s'z f i; ggjfj ljfi from ethanol the meltmg Calculated 50.29 4.20 16.76 9.61 Found 50.27 4J8 16.79 9.64

Analysis C% H% N71 5% Calculated 55.16 4.63 8.04 9.20 Found 5518 459 802 r 922 c. N'-lN-(5"-nitro-2-thenoyl) (i) phenylalanylly NH 3300 -l 0N02 L560 -l N -l5"-nitro-2"-furylacrylideneJ-hydrazine C0 CO fijfjj f amide) ;;;;g 11 10.1 g (mol/33) of N-[N-(5'-n1tro-2-thenoyl) (i) phenylalanyl1-hydrazine are dissolved at boiling point 1 r l phenylalanyl 35 in 280 ml of tetrahydrofuran. 4.9 g (mol/33) of S-nitrohydrazide 2-furyl acrolein in 49 ml of tetrahydrofuran are added dropwise thereto. After heating for 2 hours under reflux, evaporation ua to dryness is effected and then ether is recovered. 40 There are isolated 13 g of yellow product having a 0 com! CH C018 EH melting point ofl3ll33 C with a yield of 89 (the- Z n 334 34 oretical yield 14.6 g). After recrystallisation (ethanoldimethyl formamide l l and traces of water), the melting point becomes 22l.5-222 C.

A -1 20.8 g (mol/l6.7) of N -[N-(5-nitro-2- ML thenoyl)](:t) phenyl alanine ethyl ester are dissolved in Calculated 52.1 s 3.54 14.49 6.63 175 ml of tetrahydrofuran and 175 ml of methanol. 9.2 Found I 5220 3.57 1450 6.62 g (mol/5.55 9 g of 98 hydraaine hydrate in solu- NH 3280 -1 ONO2 |'54O |550 -l tion in 30 ml of methanol are then introduced slowly at (:0 L680 cm 1 l ambient temperature (in about 1 hour). The substance CO is left at ambient temperature for 48 hours and is then heated under reflux for 1 hour. After concentration to half volume, followed by adding ether, there is isolated a first cut of 11 g of yellow product of melting point 190l92 C and a second cut of 3.4 g of yellow prod- EXAMPLE not of melting point 185 C. After recrystallisation of the 14.4 g from 650 ml of ethanol, 8 g. yield N -[(5 '-nitro-2-furylacrylidene ]-N (N -5 -nitro- 2-thenoyl) (i) seryll-hydrazine n) H(5tdtto-2'thenoyl) serine cthyl estef ambient temperature for 48 hours. After filtering with suction and washing with ether, there are isolated 13.1 g 95.6 (theoretical yield 13.7 g) of a product melting at 189 C. After recrystallisation from water,-

the melting point is 190 C (with decomposition).

5 com; CB (20 Analysis C71 H7! Wt 57 CHZOH Calculated: 35.03 3.67 20.47 1 1.69

C H N o H 288.28 Found 35.05 3.69 20.50 11.79 l 7 OH 3.600 3,400 cm" CO (conjugated) 1,640 cm NH 3.300 cm" 53.8 g (mol/S) of (i) serine ethyl ester hydrochlo- CO ride are dissolved at about 0 C in 100 ml of water containing 33.5 g (mo1/2.5) of dry NaHCO There are 51- l 2 I I multaneouslv added, while stirring, 38.4 g (mo1/5) of 7 f H (N -5 nmo- S-mtro-Z-thenoyl chloride and 85 ml of an aqueous so- 9 2 3 sf ll l l lution of 16.7 g (mol/S) of NaHCO After heating at m0 0 enoy sery 500 C f l h hydrazide are dissolved at 60 C in 210 ml of ethylene or our, washing with water and drying, there 1 l 5 6 V30 5 56 f 5 2 are isolated 39.3 g ofcrystalline product having a meltg yco mo T g 0 ing point of Q C yield 2 68 (theoretical furylacrolein in 56 ml of tetrahydrofuran are added to 0 yield 57.6 g). The mother liquors. acidulated, yield the solunon' Afi b for 2 hours at 60 the i- 4 2 g of white product with a melting point of rahydrofuran is driven off under vacuum and water is 5 C added to the residue. 12.1 g of product crystallises, this WhlCll does not contain any alcohol or d I 2 0C hd amme function pro uct me ting at 17 wit ecomposition. ieil The main product, recrystallised from ethanol, has a (theorencal yield -l4'l g). After rcrybta. 13amelting point of 0 0 C tion from ethyl acetate dime thyl formamide (2 l),

the melting point is 217 C (with decomposition).

Analysis: Analysis C /i H'Yt N% 8% C?! H"/( N71 5% alculated 41.66 4.19 9.71 11.12 Calculated 42.56 3.09 16.55 7.57

Found: 41.68 4.20 9.69 11.14 Found: 42.58 3.13 16.50 7.60

y cm: CO 1,700 cm" C N 1,630 cm" cm CO 1.650 C-NO Inna-red 1 03 3,550 m (Conjugate? 2 I 540 Cm m Of the above compounds in accordance with the citxit 3,1 @11 present invention, those preferred are the compounds of Exam les 4-6 and 1 l; ofthese the compounds of Exco 1 '50 l p cm amples 5 and 1 l are the most interesting, with the com- 8 110 1,540 cm 40 pound of Example 1 1 being the most effective.

The following additional Examples of various medicinal formulations in accordance with the present inven- 4 tion are offered illustratively: C I: C 1,040 C21 Example 17 Compressed tablet Active substance 200 mg. 8 corn starch 44 mg. 1 trialinium phosphate mg. I 1 mg. b) rt {5 dam-2 thenoyl seryg-hydrazide I 3: 3a 9 mg. magnesium stearate 300 mg.

. apsule COHH Cam 1 Active substance 200 mg. 2 lactose 10 mg. CKZQH talc 20 mg. i I corn starch 30 mg. 11 74 25 260 mg. 8 1O 4f Example 19 Pediatric liquid Active substance 0.8 g. 14.4 g (mol/20) of N'- (5'-nitro-2'-thenoy1) (i) ser- Veegum K 2.0 g. ine ethyl ester are dissolved in 200 ml of methanol. At Na "bmymelhyl cellulose 03 0 Sucrose 40.0 g. a temperature of 5 C, 7.7 g (mo1/6.66 7.5 g) of gmulsono (Condensation product NH NH 98 7: H O in 24 ml of methanol are very of ethylene Oxide and I l dded castor oil; M.W 2500) 0.15 g. S OW y a Na methyl p-oxybenz0ate 0.10 g. After the addition, the mixture is cooled to 0 C and Na propyl p-oxybenzoate 0.05 g. stirring is continued for 2 hours. The mixture is left at 352$? 33%;: 52 g:

Citric acid sufficient to provide a pH of about 7 purified water sufficient to make 100 ml. of suspension In each of Examples 17-19, the compounds of Example 2-16 are used as the active substance. If desired, the active substance may consist of mixtures of compounds falling within the generic formula, or even mixtures of such compounds with other previously known compounds which exhibit similar activity.

The foregoing description of the specific embodiments will so fully reveal the general nature of the invention that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation.

What is claimed is:

l. A pharamaceutical composition adapted for administration to obtain an antibacterial effect, comprising, per dosage unit a pharmaceutically acceptable excipient, and

an antibacterially effective non-toxic amount of a compound of the formula ll ll ca cu cu N02 I l I I w erein R1 is 02R s or s 6. A composition in accordance with claim 5 wherein RisHornisO 7. A composition in accordance with claim 6 wherein said compound is selected from the group consisting of N -[5-nitro-2'-thenoyl] -l\l -[5"-nitro-2"- furylacrylidene] -hydrazine and N -[5-nitro-2'- thenoylglycyl] -N -[5"-nitro-2"-furylacrylidene] hydrazine.

8. A pharamaceutical composition adapted for administration to obtain an antibacterial effect, comprising, per dosage unit a pharmaceutically acceptable excipient, and

an antibacterially effective nontoxic amount of a compound of the formula I G-(NH-Elli-C(D -NH-N-CH-CH-CHQN0 wherein n is l or 0; G is thenoyl, nitrothenoyl or carbobenzoxy; and R is H, methyl, butyl, isobutyl, 8-(2- furoyl) aminobutyl, benzyl, hydroxymethyl or phydroxybenzyl.

2. The composition of claim 1 wherein said compound is N [5 nitro 2 thenoyl] N [5" nitro 2" 4 -furylacrylidene] hydrazine. 3. A composition in accordance with claim 1 in a form adapted for oral administration.

4. A composition in accordance with claim 1 in unit dosage form wherein said compound is present in an amount of 10 to 500 mg.

5. A composition in accordance with claim 1 wherein said compound has the formula GNH-qH-CONH-N=CH-CH= ll ll CH N0 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3,914,379 DATED October 21, 1975 lNVENTORt'S) SZARVASI et a1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 9, lines 37-38 Example 7 2should read f: --N -[5' -nitro -2' furylacrylidene] -N -[N ,N -2"-di Y -(i) Y Y hydrazine:

Column 13, line 22, "BP" should read --B Column 20, line 7, delete "n" at the end of the line Colurm 21, line 49, the beginning of the formula is --N -[N' -(5' -nitro-2' Column 23, line 11, "53.8 g" should read --33.8 g-

Signed and Scaled this seventeenth Day Of February 1976 [SEAL] Attest:

RUTH C. MASON C. MARSHALL DANN Arresting Officer Commissioner uj'Parents and Trademarks 

1. A PHARAMACEUTICAL COMPOSITION ADAPTED FOR ADMINISTRATION TO OBTAIN AN ANTIBACTERIAL EFFECT, COMPRISING, PER DOSAGE UNIT A PHARMACEUTIALLY ACCEPTABLE EXCIPIENT, AND AN ANTIBACTERIALLY EFFECTIVE NON-TOXIC AMOUNT OF A COMPOUND OF THE FORMULA
 2. The composition of claim 1 wherein said compound is N1 - (5'' - nitro - 2'' thenoyl) - N2 - (5'''' - nitro - 2'''' -furylacrylidene) - hydrazine.
 3. A composition in accordance with claim 1 in a form adapted for oral administration.
 4. A composition in accordance with claim 1 in unit dosage form wherein said compound is present in an amount of 10 to 500 mg.
 5. A composition in accordance with claim 1 wherein said compound has the formula
 6. A composition in accordance with claim 5 wherein R is H or n is
 0. 7. A composition in accordance with claim 6 wherein said compound is selected from the group consisting of N1 -(5''-nitro-2''-thenoyl) -N2 -(5''''-nitro-2''''-furylacrylidene) -hydrazine and N1 -(5''-nitro-2''-thenoylglycyl) -N2 -(5''''-nitro-2''''-furylacrylidene) - hydrazine.
 8. PHARAMACEUTIAL COMPOSITION ADAPTED FOR ADMINISTRATION TO OBTAIN AN ANTIBACTERIAL EFFECT, COMPRISING, PER DOSAGE UNIT A PHARMACEUTICALLY ACCEPTABLE EXCIPIENT, AND AN ANTIBACTERIALLY EFFECTIVE NONTOXIC AMOUNT OF A COMPOUND OF THE FORMULA
 9. A method for treating bacterial infections which comprises administering an antibacterially effective non-toxic amount of the compound of claim 1 to a patient. 